Linear motors and oil production equipment

Abstract

The present application discloses a linear motor and oil production equipment. The linear motor includes a stator module and a mover module. The stator module includes multiple stator assemblies, each comprising an outer sleeve, an inner liner, and a coil winding. The coil winding and the inner liner are disposed in the outer sleeve, and the coil winding is sleeved on the inner liner and sealed between the outer sleeve and the inner liner. The mover module includes multiple mover assemblies and a mover connecting sleeve. The mover assembly includes a mover core shaft and a permanent magnet. The permanent magnet is disposed outside the mover core shaft, and an oil channel is formed inside the mover core shaft. The side wall of the mover connecting sleeve is provided with a through-hole. Two adjacent mover core shafts are connected together by the mover connecting sleeve, and two adjacent oil channels are connected through the mover connecting sleeve. The mover module is disposed in the stator module, and the mover core shaft can slide in the inner liner, forming an oil path gap between the mover module and the inner liner. This improves the reliability of the linear motor and oil production equipment.

Description

Technical Field

[0001] The present application relates to the field of mechanical technology, and in particular to a linear motor and oil production equipment. Background Art

[0002] With the continuous improvement of oil extraction technology and the increasing difficulty of extraction, higher requirements are placed on the oil extraction equipment used in oil extraction. At present, the development of downhole submersible linear motor technology and oil pump technology is often used to achieve the effect of downhole oil extraction and improve the service life of the oil extraction equipment.

[0003] The linear motor oil extraction method involves placing an oil well pump in the oil well, and using the linear motor to drive the pump to pump oil. For example, Chinese Patent Publication No. CN112283063A discloses an integrated pump and pump device and method. The stator portion of the linear motor is assembled in a pump barrel, and the rotor serves as a plunger. Under the excitation magnetic field of the motor stator, the pump plunger reciprocates to pump oil. However, the pump barrel requires a certain strength, and its walls are relatively thick, resulting in a large air gap between the motor and the pump, which affects the motor's efficiency. Furthermore, the pump plunger is integrated into the motor's rotor and located within the motor's stator. The pump plunger requires several ball valves built into the motor's stator to operate, resulting in a complex overall structure and low pumping efficiency. Chinese Patent Publication No. CN108880178 A discloses a multi-stage linear motor and its associated oil pump. These utilize separate linear motors and pumps. However, during use, the linear motor needs to exert thrust on the pump. This, limited by the linear motor's structural strength, results in a short stroke and low pumping efficiency.

[0004] In view of this, how to design a technology to improve oil pumping efficiency is the technical problem to be solved by this application. Summary of the Invention

[0005] The technical problem to be solved by the present application is to provide a linear motor and oil production equipment to improve the reliability of the oil production equipment and increase the oil pumping efficiency.

[0006] The technical solution provided by this application is a linear motor, comprising:

[0007] The stator module includes multiple stator assemblies, each of which includes an outer sleeve, an inner liner, and a coil winding. The coil winding and the inner liner are arranged in the outer sleeve, and the coil winding is sleeved on the inner liner and sealed between the outer sleeve and the inner liner. Two adjacent outer sleeves are sealed together.

[0008] The mover module includes multiple mover components and a mover connecting sleeve. The mover component includes a mover core shaft and a permanent magnet. The permanent magnet is arranged on the outside of the mover core shaft, and an oil channel is formed inside the mover core shaft. The side wall of the mover connecting sleeve is provided with a through-hole. Two adjacent mover core shafts are connected together through the mover connecting sleeve, and two adjacent oil channels are connected through the mover connecting sleeve.

[0009] Among them, the mover module is arranged in the stator module, the mover core shaft can slide in the inner lining tube, and an oil path gap is formed between the mover module and the inner lining tube.

[0010] In one embodiment of the present application, the oil circuit gap is connected to the oil channel.

[0011] In one embodiment of the present application, the oil channel is configured so that when the mover core shaft is in the downstroke motion, the oil flows upward in the oil channel;

[0012] The oil passage gap is configured so that oil flows upward in the oil passage gap when the mover core shaft is in a downward stroke motion.

[0013] In one embodiment of the present application, the oil channel is configured so that when the mover core shaft is in an upward stroke motion, the oil flows downward in the oil channel;

[0014] The oil passage gap is configured so that the oil flows downward in the oil passage gap when the mover core shaft is in an upward stroke motion.

[0015] In one embodiment of the present application, the stator assembly further includes two end seals, each end seal being provided with a first mounting through hole;

[0016] The end seal is sealed and inserted into the corresponding pipe opening of the outer sleeve, and the end of the liner pipe is sealed and inserted into the first installation through hole;

[0017] The coil winding is located between the two end seals, and the mover core shaft passes through the first installation through hole.

[0018] In one embodiment of the present application, the stator module further includes a stator connector, and the stator connector is provided with a second mounting through hole;

[0019] Two adjacent stator assemblies are sealed and fixedly connected together through a stator connector. The stator connector is sealed and connected to the end seals at the corresponding ends of the stator assembly. The mover core shaft passes through the second installation through hole.

[0020] In one embodiment of the present application, a first wiring hole is provided on the end sealing member, and a second wiring hole is provided on the stator connecting member;

[0021] For the end seal and the stator connector connected together, the first wiring hole is communicated with the second wiring hole;

[0022] The cables connected to the coil winding pass through the first wiring hole and the second wiring hole;

[0023] The stator module also includes a motor head and an external terminal. The motor head is further provided with a third mounting through-hole. The motor head is further provided with a wiring channel, and the external terminal is sealed and disposed in the wiring channel. The motor head is connected to the stator assembly at the top, and the third mounting through-hole is configured to allow the mover core shaft to pass through.

[0024] The cables connected to the coil windings also extend into the wiring channel and are connected to external wiring terminals.

[0025] In one embodiment of the present application, a first key slot is further provided on the inner end surface of the end seal, a second key slot is provided on the stator core of the coil winding, the first key slot is connected to the second key slot, and the cables connected to the coil winding are also arranged in the first key slot and the second key slot.

[0026] In one embodiment of the present application, the stator module further includes:

[0027] The pressure balancing assembly includes an outer protective tube and an oil pressure sensing component, and the oil pressure sensing component is arranged in the outer protective tube;

[0028] A first pressure balancing chamber is formed in the oil pressure sensing component, and the first pressure balancing chamber is configured to be filled with electrical insulating oil; the oil pressure sensing component is configured to deform under the hydraulic pressure in the outer protective tube to adjust the pressure in the first pressure balancing chamber;

[0029] A second pressure balance chamber is formed between the outer sleeve and the inner liner, and the second pressure balance chamber is configured to be filled with electrical insulating oil;

[0030] Wherein, the first pressure balance chamber and the second pressure balance chamber are communicated.

[0031] In one embodiment of the present application, the pressure balancing assembly is disposed between two adjacent stator assemblies, and the movable core shaft of at least one movable assembly is inserted into the outer sleeve;

[0032] Alternatively, the pressure balancing component is arranged on the stator component at the lower end of the stator module, and the mover core shaft of at least one mover component is inserted into the outer sleeve.

[0033] In one embodiment of the present application, the first pressure-balancing chamber is communicated with the second pressure-balancing chamber respectively;

[0034] Alternatively, two adjacent second pressure-balancing chambers are communicated with each other, and the first pressure-balancing chamber is communicated with the second pressure-balancing chamber in the bottom movable subassembly.

[0035] In one embodiment of the present application, the stator assembly further includes two end seals, each end seal being provided with a first mounting through hole;

[0036] The end seals are sealably inserted into the corresponding pipe openings of the outer sleeve, and the end seals of the inner liner are sealably inserted into the first installation through-hole; the outer sleeve and the inner liner form a second pressure balance cavity between the two end seals, the coil winding is located between the two end seals, and the mover core shaft passes through the first installation through-hole;

[0037] In one embodiment of the present application, a first pressure communication hole is further provided on the end seal, and the first pressure communication hole is connected to the second pressure balance cavity;

[0038] In two stator assemblies connected together, the first pressure communication hole in one stator assembly is communicated with the adjacent first pressure communication hole in the other stator assembly.

[0039] In one embodiment of the present application, the stator module further includes a stator connector, the stator connector is provided with a second mounting through hole, and the stator connector is further provided with a second pressure communication hole;

[0040] Two adjacent stator assemblies are sealed and fixedly connected together through a stator connector, the stator connector is sealed and connected to the end seals of the corresponding ends of the stator assembly, and the mover core shaft passes through the second mounting through hole;

[0041] With the end seal and the stator connection member connected together, the first pressure communication hole is communicated with the second pressure communication hole.

[0042] In one embodiment of the present application, the stator module further includes a motor head and an external terminal. The motor head is further provided with a third mounting through-hole, a wiring channel, and an oil filling hole. The oil filling hole and the wiring channel are arranged on the outside of the third mounting through-hole. The external terminal is sealed in the wiring channel. The motor head is connected to the stator assembly at the top. The third mounting through-hole is configured to allow the mover core shaft to pass through.

[0043] The cables connected to the coil windings also extend into the wiring channel and are connected to the external terminal blocks;

[0044] The oil filling hole is connected to the adjacent second pressure balance cavity.

[0045] In one embodiment of the present application, the linear motor further comprises an upper buffer oil pipe and / or a lower buffer oil pipe; the upper buffer oil pipe is arranged at the top of the stator module, and the lower buffer oil pipe is arranged at the bottom of the stator module; the upper buffer oil pipe is configured to communicate with the upper mover core shaft, and the lower buffer oil pipe is configured to communicate with the lower mover core shaft;

[0046] And / or, the mover module also includes a lower buffer connection assembly, which includes two lower mounting seats and a lower spring, the lower spring is connected between the two lower mounting seats, the upper lower mounting seat is connected to the mover core shaft at the bottom, and the lower mounting seat is configured to be connected to the oil pump.

[0047] The present application also provides an oil production equipment, including an oil pump and the above-mentioned linear motor. The oil pump is arranged below the linear motor. The linear motor is arranged vertically, and the mover core shaft of the mover assembly located at the bottom of the linear motor is connected to the oil pump.

[0048] The present application also provides an oil production equipment, including an oil pump and the above-mentioned linear motor, wherein the linear motor is arranged horizontally, the oil pump is arranged at the rear end of the linear motor, and the mover core shaft of the mover assembly located at the rear end of the linear motor is connected to the oil pump.

[0049] Compared with the prior art, the advantages and positive effects of the present application are: by sealing the stator assembly into the mounting sleeve, an auxiliary flow channel is formed between the stator assembly and the mounting sleeve, and an oil channel is formed in the mover core shaft of the mover module, and the auxiliary flow channel and the oil channel are interconnected. During use, the oil pump is connected to the bottom of the mover module, and the mover core shaft will provide pulling force to the oil pump to lift the oil upward. In this way, the requirements for the structural strength of the mover core shaft can be reduced, and the reciprocating stroke of the mover core shaft can be extended to meet the use requirements of oil pumps with different strokes, expand the scope of use, make the working state of the oil pump more reasonable and reliable, and can operate stably for a long time, improve the oil pumping volume and oil pumping efficiency, and extend the pump inspection cycle.

[0050] In addition, the oil channel formed in the core shaft of the mover and the auxiliary flow channel between the outer sleeve and the mounting sleeve can allow the oil extracted by the oil pump to flow upward. At the same time, the oil can flow between the oil channel and the auxiliary flow channel according to the pressure difference of the oil pressure. In this way, during the reciprocating operation of the mover assembly, the oil can flow between the oil channel and the auxiliary flow channel. On the one hand, the flowing oil can absorb heat and cool down to improve the operating reliability of the linear motor. On the other hand, the flowing oil can reduce the resistance and pressure generated during the upward stroke of the mover assembly, and can also provide a certain damping force to the mover assembly when the mover assembly is downward, so as to improve the stability and smoothness of the operation.

[0051] In addition, the linear motor has the ability to withstand high pressure in terms of structural design, mechanical strength and sealing performance, and can meet the high-pressure working environment of oil pumping in oil wells. The oil pump is installed at the bottom or rear of the linear motor. The linear motor can work both in the submerged oil state and in the state of being separated from the well fluid. When the well fluid is lifted to the ground, the motor rotor and the oil pump plunger are subjected to tensile stress. The force mode is reasonable and the system is stable. The linear motor works in the state of being separated from the well fluid, which means that the linear motor is installed in the oil well and the pump is submerged above the liquid level. This can also ensure that the cable is completely separated from the long-term immersion in the well fluid, thereby extending the service life of the cable.

[0052] In addition, the tubular oil pumps or rod oil pumps currently widely used in oil fields can be used in conjunction with the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0054] Figure 1 This is a schematic structural diagram of an embodiment of a linear motor of the present application;

[0055] Figure 2 This is a cross-sectional view of an embodiment of a linear motor of the present application;

[0056] Figure 3 for Figure 2 A partial enlarged schematic diagram of area A in the middle;

[0057] Figure 4 for Figure 2 A partial enlarged schematic diagram of area B in the middle;

[0058] Figure 5 for Figure 1 Assembly drawing of the stator assembly, stator connector and motor head;

[0059] Figure 6 for Figure 1 a cross-sectional view of the stator assembly;

[0060] Figure 7 for Figure 1 Schematic diagram of the partial structure of the stator assembly and stator connector;

[0061] Figure 8 for Figure 7 Schematic diagram of the structure of the middle end seal;

[0062] Figure 9 for Figure 1 Schematic diagram of the structure of the stator connector;

[0063] Figure 10 Schematic diagram of the assembly of the mover assembly and the mover connector;

[0064] Figure 11 for Figure 10 Assembly cross-sectional view of the middle mover assembly and the mover connector;

[0065] Figure 12 for Figure 10 Schematic diagram of the structure of the middle mover connector;

[0066] Figure 13 for Figure 1 Schematic diagram of the structure of the pressure balance component;

[0067] Figure 14 for Figure 1 Cross-sectional view of the pressure balance assembly.

[0068] Reference numerals:

[0069] 1. Stator module; 11. Stator assembly; 12. Stator connector; 13. Motor head; 14. External terminal; 15. Pressure balance assembly; 10. Oil circuit clearance;

[0070] 111. Outer sleeve; 112. Inner liner; 113. Coil winding; 114. End seal; 115. Second pressure balance chamber;

[0071] 1141, first installation through hole; 1142, first wiring hole; 1143, first keyway; 1144, first pressure communication hole;

[0072] 1131, second keyway;

[0073] 121, second installation through hole; 122, second wiring hole; 123, second pressure communication hole;

[0074] 131. Wiring channel; 132. Oil filling hole;

[0075] 151. Outer protective tube; 152. Oil pressure sensing component; 153. First pressure balance chamber;

[0076] 2. Mover module; 21. Mover assembly; 22. Mover connecting sleeve; 23. Lower buffer connecting assembly;

[0077] 211, mover core shaft; 212, permanent magnet; 213, oil channel;

[0078] 221, through-mouth;

[0079] 231, lower mounting seat; 232, lower spring;

[0080] 3. Lower the cache oil pipe. DETAILED DESCRIPTION

[0081] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0082] like Figures 1-14 As shown, an embodiment of the present application provides a linear motor, comprising:

[0083] Stator module 1, stator module 1 includes multiple stator assemblies 11, stator assembly 11 includes outer sleeve 111, inner liner 112 and coil winding 113, coil winding 113 and inner liner 112 are arranged in outer sleeve 111, coil winding 113 is sleeved on inner liner 112 and sealed between outer sleeve 111 and inner liner 112, and two adjacent outer sleeves 111 are sealed together;

[0084] The mover module 2 includes a plurality of mover assemblies 21 and a mover connecting sleeve 22. The mover assembly 21 includes a mover core shaft 211 and a permanent magnet 212. The permanent magnet 212 is arranged on the outside of the mover core shaft 211, and an oil channel 213 is formed inside the mover core shaft 211. The side wall of the mover connecting sleeve 22 is provided with a through-hole 221. Two adjacent mover core shafts 211 are connected together by the mover connecting sleeve 22, and two adjacent oil channels 213 are connected through the mover connecting sleeve 22.

[0085] The mover module 2 is arranged in the stator module 1 , and the mover core shaft 211 can slide in the inner liner tube 112 , and an oil path gap 10 is formed between the mover module 2 and the inner liner tube 112 .

[0086] Specifically, the linear motor provided in the present application is equipped with a mover module 2 in a stator module 1. The coil winding 113 in the stator module 1 is energized to cooperate with the permanent magnet 212 in the mover module 2 to enable the permanent magnet 212 to drive the mover core shaft 211 to move back and forth in the stator module 1.

[0087] For the stator module 1, the outer sleeve 111 serves as an external support and protective component. The thickness of the outer sleeve 111 must meet the requirements for pressure resistance and structural strength. The inner liner 112 and coil winding 113 are installed in the outer sleeve 111. The coil winding 113 is located in the sealed space formed between the outer sleeve 111 and the inner liner 112 to insulate the coil winding 113 from the oil. The inner protective tube is made of non-magnetic material to ensure sufficient magnetic force between the coil winding 113 and the permanent magnet 212.

[0088] For the mover module 2, the mover core shaft 211 serves as a support and mounting component, and the permanent magnet 212 is mounted and fixed on the outside of the mover core shaft 211. The interior of the mover core shaft 211 is a hollow structure to form an oil channel 213. In this way, when the mover core shaft 211 drives the oil pump at the bottom, the oil pumped by the oil pump can be transported upward through the mover core shaft 211 to achieve the goal of transporting the oil to the ground.

[0089] When the mover core shaft 211 drives the oil well pump, the mover core shaft 211 provides a pulling force to the oil well pump so that the oil well pump pumps oil into the oil channel 213. The mover core shaft 211 can provide a large pulling force, thereby meeting the use requirements of a high-power oil well pump.

[0090] The oil flowing in the oil channel 213 in the mover core shaft 211 can also flow into the oil gap 10 through the through-hole 221 , and during use, the oil can flow between the oil gap 10 and the oil channel 213 .

[0091] During use, the oil in the oil gap 10 can also carry away the heat generated by the coil winding 113 in the corresponding position through heat exchange with the inner lining tube 112, thereby improving the reliability of the linear motor.

[0092] The flow cross-sectional area of ​​the oil channel 213 is much larger than the flow cross-sectional area of ​​the oil gap 10. During use, the oil flows between the oil gap 10 and the oil channel 213, which can improve the smooth operation of the movable subassembly 21 and effectively reduce the internal pressure.

[0093] Among them, when the movable core shaft 211 is in the downward stroke movement, the movable component 21 drives the oil pump plunger used in conjunction with the present application downward, and will enter the oil pump barrel. The oil located at the lower part of the plunger is squeezed into the pump barrel above the plunger, and preparations are made for the next oil pumping. At this time, the oil in the lower buffer oil pipe 3 flows upward relative to the movable core shaft 211 in the oil channel 213; the oil flows upward relative to the inner liner 112 in the oil circuit gap 10. The flow direction of the oil conforms to the principles of thermodynamics. The upward flowing oil fully absorbs the heat generated by the linear motor when it is working in the process of flowing through the linear motor, and brings the heat to the front oil pipe of the motor head 13. In the next oil pumping process, it is continued to be pushed toward the wellhead.

[0094] In addition, when the movable core shaft 211 is in the upward stroke, the movable assembly 21 drives the oil pump plunger upward, lifting the oil in the pump barrel above the oil pump plunger into the lower buffer oil pipe 3. At the same time, the front part of the movable assembly 21, when entering the oil pipe space in front of the motor head 13, pushes the oil in the oil pipe space to flow toward the wellhead. Because the diameter of the movable assembly 21 is slightly larger than the diameter of the oil pump plunger, a small amount of oil flows downward relative to the movable core shaft 211 in the oil channel 213; a small amount of oil flows downward relative to the inner liner 112 in the oil circuit gap 10 and flows into the lower buffer oil pipe 3. The volume of this part of the oil flowing downward offsets the volume difference between the movable assembly 21 and the oil pump plunger of the same stroke. Therefore, during the upward stroke, the force acting on the movable assembly 21 is only the resistance of the oil pump plunger to move upward.

[0095] As described above, the linear motor rotor assembly 21 drives the lower oil pump plunger to continuously pump the oil in the oil well from the deep oil layer to the surface wellhead in a regular upward and downward reciprocating motion, thereby realizing a complete and efficient oil production process. Since the pumped oil fully absorbs the heat of the linear motor, the oil temperature is higher than that of conventional oil production methods, and wax deposition and freezing will not occur in the oil pipe.

[0096] In one embodiment of the present application, the stator assembly 11 further includes two end seals 114 , and the end seals 114 are provided with first mounting through holes 1141 ;

[0097] The end seal 114 is sealed and inserted into the corresponding pipe opening of the outer sleeve 111, and the end of the liner pipe 112 is sealed and inserted into the first installation through hole 1141;

[0098] The coil winding 113 is located between the two end seals 114 , and the mover core shaft 211 passes through the first installation through-hole 1141 .

[0099] Specifically, to facilitate the sealed installation of the coil winding 113 in the stator assembly 11, end seals 114 are provided at the two ends of the stator assembly 11. The end seals 114 can seal and connect the outer sleeve 111 and the inner liner 112 at the corresponding end positions, thereby allowing the coil winding 113 to be sealed and assembled between the outer sleeve 111 and the inner liner 112.

[0100] The sealing method between the end seal 114 and the outer sleeve 111 and the inner liner 112 can be welding or adding a sealing ring, etc., which is not limited here.

[0101] Furthermore, the stator module 1 further includes a stator connector 12, and the stator connector 12 is provided with a second mounting through hole 121;

[0102] Two adjacent stator assemblies 11 are sealed and fixedly connected together via a stator connector 12 . The stator connector 12 is sealed and connected to the end seals 114 at the corresponding ends of the stator assemblies 11 . The mover core shaft 211 passes through the second mounting through hole 121 .

[0103] Specifically, for two adjacent stator assemblies 11, in order to connect them conveniently and quickly, the two adjacent stator assemblies 11 are connected and fixed through a stator connector 12. The stator connector 12 can be connected to the end seals 114 at the corresponding ends of the stator assembly 11 by bolts or the like.

[0104] Furthermore, in order to facilitate the power supply of each coil winding 113 through a cable, a first wiring hole 1142 is provided on the end seal 114 and a second wiring hole 122 is provided on the stator connector 12;

[0105] For the end seal 114 and the stator connector 12 connected together, the first wiring hole 1142 is connected to the second wiring hole 122;

[0106] The cables connected to the coil winding 113 pass through the first wiring hole 1142 and the second wiring hole 122;

[0107] The stator module 1 also includes a motor head 13 and an external terminal 14. The motor head 13 is further provided with a third mounting through-hole. The motor head 13 is also provided with a wiring channel 131. The external terminal 14 is sealed and disposed in the wiring channel 131. The motor head 13 is connected to the top stator assembly 11. The third mounting through-hole is configured to allow the mover core shaft 211 to pass through.

[0108] The cables connected to the coil winding 113 also extend into the wiring channel 131 and are connected to the external connection terminals 14 .

[0109] Specifically, to power the coil windings 113 in the stator module 1, an external power source is connected to the coil windings 113 in different stator assemblies 11 via cables. Due to the long overall length of the stator module 1, a motor head 13 is located on the topmost stator assembly 11 to facilitate cable routing. This motor head 13 is equipped with external terminals 14, which connect to an external power source. Inside the stator module 1, cables extend into a wiring channel 131 and connect to the external terminals 14.

[0110] In this way, between two adjacent stator assemblies 11 , cables can be routed through the first wiring hole 1142 and the second wiring hole 122 , and the top motor head 13 can be powered through the external terminal 14 and electrically connected to the cables in the wiring channel 131 .

[0111] In one embodiment, in order to facilitate the positioning of the coil winding 113 in the stator assembly 11 and to facilitate the wiring inside the stator assembly 11, a first keyway 1143 is further provided on the inner end surface of the end seal 114, and a second keyway 1131 is provided on the stator core of the coil winding 113. The first keyway 1143 is connected to the second keyway 1131, and a positioning key (not shown) is provided in the second keyway 1131, and the end of the positioning key is inserted into the first keyway 1143.

[0112] Specifically, inside the stator assembly 11, the cables are routed through the first wiring holes 1142 of the end seals 114, and the cables need to be precisely connected to the sequentially stacked coil windings 113. To this end, the sequentially stacked coil windings 113 need to be accurately positioned. By providing a second keyway 1131 on the stator core of the coil windings 113, the multiple coil windings 113 are accurately positioned using a positioning key. At the same time, the end of the positioning key is also inserted into the first keyway 1143 of the end seal 114 to achieve high-precision relative positioning between the end seal 114 and the coil windings 113, thereby facilitating accurate cable routing during assembly.

[0113] In another embodiment of the present application, the stator module 1 further includes:

[0114] The pressure balancing assembly 15 includes an outer protective tube 151 and an oil pressure sensing component 152 . The oil pressure sensing component 152 is disposed in the outer protective tube 151 .

[0115] A first pressure balancing chamber 153 is formed in the oil pressure sensing component 152. The first pressure balancing chamber 153 is configured to be filled with electrical insulating oil. The oil pressure sensing component 152 is configured to deform under the hydraulic pressure in the outer protective tube 151 to adjust the pressure in the first pressure balancing chamber 153.

[0116] A second pressure balance chamber 115 is formed between the outer sleeve 111 and the inner liner 112 , and the second pressure balance chamber 115 is configured to be filled with electrical insulating oil;

[0117] The first pressure-balancing chamber 153 and the second pressure-balancing chamber 115 are in communication.

[0118] Specifically, in order to reduce the overall peripheral size of the linear motor, the outer sleeve 111 needs to be made of thicker material to meet the structural strength requirements, and the inner lining tube 112 is as thin as possible to reduce the overall peripheral size.

[0119] However, due to the on-site working conditions of oil production, the linear motor needs to dive to a deeper stratum. Under the influence of the oil pressure at the bottom, the inner liner 112 needs to withstand the oil pressure in the oil path gap 10. A thinner inner liner 112 may be damaged due to its low structural strength. However, by adding the pressure balancing assembly 15, the first pressure balancing chamber 153 formed by the pressure balancing assembly 15 is connected to the adjacent second pressure balancing chamber 115, and the two adjacent second pressure balancing chambers 115 are also connected to each other. Under the action of the internal electrical insulating oil, the pressure of the first pressure balancing chamber 153 can be basically the same as the pressure of the different second pressure balancing chambers 115.

[0120] In this way, during use, the oil pressure sensing component 152 will produce corresponding deformation due to the pressure of the oil in the outer protective tube 151, so that the pressure of the electrical insulating oil in the first pressure balance cavity 153 is basically the same as the pressure of the oil in the outer sheath. In this way, the pressure of the electrical insulating oil in the different second pressure balance cavity 115 can be close to the oil pressure in the oil circuit gap 10, so that the structural strength of the thinner inner lining tube 112 itself can meet the use requirements of the pressure difference on both sides, thereby improving the safety and reliability of the linear motor and meeting the design requirements of miniaturization of the peripheral size of the linear motor.

[0121] The oil pressure sensing component 152 can be a pressure capsule filled with electrical insulating oil, which rests against the inner wall of the outer protective tube 151 and is located outside the movable assembly 21. Alternatively, the oil pressure sensing component 152 includes a support tube and an elastic tube, the ends of which are sealed together to form a first pressure-balancing chamber 153. The oil pressure sensing component 152 is sleeved on the outside of the movable assembly 21, and the elastic tube is deformed by the external oil pressure to achieve a relatively small difference between the second pressure-balancing chamber 115 and the external oil pressure. The specific structural form of the oil pressure sensing component 152 is not limited or elaborated upon herein.

[0122] In one embodiment, the pressure balancing assembly 15 is disposed between two adjacent stator assemblies 11, and the movable core shaft 211 of at least one movable assembly 21 is inserted into the outer sleeve 111. In this case, the two adjacent second pressure balancing chambers 115 are interconnected, and the first pressure balancing chamber 153 is respectively interconnected with the second pressure balancing chamber 115.

[0123] Alternatively, the pressure balancing assembly 15 is disposed on the stator assembly 11 at the lower end of the stator module 1, and the mover core shaft 211 of at least one mover assembly 21 is inserted into the outer sleeve 111. In this case, two adjacent second pressure balancing chambers 115 communicate with each other, and the first pressure balancing chamber 153 communicates with the second pressure balancing chamber 115 in the bottom mover assembly 21.

[0124] Specifically, in order to facilitate the wiring and installation of cables, an example is given in which the pressure balancing assembly 15 is arranged on the stator assembly 11 at the bottom.

[0125] During use, after the linear motor is placed in the oil well, the pressure balance component 15 is arranged next to the oil pump at the bottom. The oil pumped by the oil pump will first flow into the pressure balance component 15 and then flow through each stator component 11 in turn. The oil pressure sensing component 152 adjusts the internal electrical insulating oil pressure according to the external oil pressure to ensure the reliable operation of the linear motor.

[0126] Furthermore, the stator assembly 11 further includes two end seals 114 , and the end seals 114 are provided with first mounting through holes 1141 ;

[0127] The end seal 114 is sealed and inserted into the corresponding pipe opening of the outer sleeve 111, and the end seal of the inner liner tube 112 is sealed and inserted into the first mounting through hole 1141; the outer sleeve 111 and the inner liner tube 112 form a second pressure balance cavity 115 between the two end seals 114, the coil winding 113 is located between the two end seals 114, and the rotor core shaft 211 passes through the first mounting through hole 1141.

[0128] Specifically, the outer tube 111 and the inner tube 112 in the stator assembly 11 are sealed and connected via the end seal 114 to form a second pressure-balancing chamber 115. To achieve interconnection between the second pressure-balancing chambers 115, a first pressure communication hole 1144 is provided on the end seal component, and the first pressure communication hole 1144 communicates with the second pressure-balancing chamber 115.

[0129] Specifically, the electrical insulating oil in the second pressure balancing chamber 115 can enter and exit through the first pressure communication hole 1144 , so that the electrical insulating oil can be used to balance the pressure in the second pressure balancing chamber 115 at different positions.

[0130] Among the two connected stator assemblies 11, the first pressure communication hole 1144 in one stator assembly 11 communicates with the adjacent first pressure communication hole 1144 in the other stator assembly 11. In addition, for the stator assembly 11 adjacent to the pressure balancing assembly 15, the stator assembly 11 communicates with the first pressure balancing cavity 153 of the pressure balancing assembly 15 through the first pressure communication hole 1144.

[0131] In addition, for the first keyway 1143 arranged on the end seal 114, the first keyway 1143 extends on the end face of the end seal 114, one end of the first keyway 1143 extends to the first mounting through hole 1141 and is connected to the first mounting through hole 1141, and the other end of the first keyway 1143 extends to the outer wall of the end seal 114. At the same time, the first pressure connecting hole 1144 is located in the first keyway 1143.

[0132] In this way, after assembly, the electrical insulating oil in the first pressure balance cavity can enter and exit the first pressure communication hole 1144 through the transversely arranged first key groove 1143 to ensure smooth flow of the internal electrical insulating oil between different pressure balance cavities.

[0133] Furthermore, the stator module 1 further includes a stator connector 12, the stator connector 12 is provided with a second installation through hole 121, and the stator connector 12 is also provided with a second pressure communication hole 123;

[0134] Two adjacent stator assemblies 11 are sealed and fixedly connected together by a stator connector 12. The stator connector 12 is sealed and connected to the end seals 114 at the corresponding ends of the stator assembly 11. The mover core shaft 211 passes through the second mounting through hole 121.

[0135] With the end seal 114 and the stator connector 12 connected together, the first pressure communication hole 1144 is in communication with the second pressure communication hole 123 .

[0136] Specifically, two adjacent stator assemblies 11 are connected and fixed together via a stator connector 12 . The specific description of how the stator connector 12 connects the two stator assemblies 11 together will not be repeated here.

[0137] A second pressure communicating hole 123 is provided on the stator connector 12. For two adjacent stator assemblies 11, the stator connector 12 is connected to the corresponding end seals 114, and the first pressure communicating holes 1144 of the two end seals 114 are connected through the second pressure communicating hole 123 of the stator connector 12.

[0138] Furthermore, the stator module 1 further includes a motor head 13 and an external terminal 14. The motor head 13 is provided with a third mounting through-hole, an oil injection hole 132, and a wiring channel 131. The oil injection hole 132 and the wiring channel 131 are arranged outside the third mounting through-hole. The external terminal 14 is sealed and disposed in the wiring channel 131.

[0139] The motor head 13 is connected to the stator assembly 11 at the top, and the third mounting through hole is configured to allow the mover core shaft 211 to pass through;

[0140] The cables connected to the coil winding 113 also extend into the wiring channel 131 and are connected to the external connection terminal 14;

[0141] The oil filling hole 132 is connected to the adjacent second pressure balance chamber 115 .

[0142] Specifically, the motor head 13 is fixedly mounted on the topmost stator assembly 11, and the stator assembly 11 can be sealed and fixedly connected to the motor head 13 via the stator connector 12. Regarding the specific method for connecting the motor head 13 and the external terminal 14 to the coil winding 113, please refer to the above description and will not be repeated here.

[0143] An oil filling hole 132 is provided on the motor head 13. During the assembly process, electrical insulating oil can be injected into the second pressure balance cavity 115 through the oil filling hole 132 so that the second pressure balance cavity 115 and the first pressure balance cavity 153 are filled with electrical insulating oil.

[0144] In another embodiment of the present application, the linear motor further includes an upper buffer oil pipe and / or a lower buffer oil pipe 3 .

[0145] The upper cache oil pipe is arranged at the top of the stator module 1, and the lower cache oil pipe is arranged at the bottom of the stator module 1; the upper cache oil pipe is configured to communicate with the upper mover core shaft 211, and the lower cache oil pipe 3 is configured to communicate with the lower mover core shaft 211.

[0146] Specifically, for the lower cache oil pipe 3, during use, on the one hand, after the multiple movable components 21 at the bottom are moved out from the bottom stator component 11, they can continue to be protected by the lower cache oil pipe; on the other hand, during the upward movement of the movable component 21, the oil pumped by the oil pump enters the lower cache oil pipe to ensure that the oil can be pumped out smoothly and efficiently.

[0147] Similarly, for the upper cache oil pipe, during use, on the one hand, after the multiple mover assemblies 21 at the top are moved out from the top stator assembly 11, they can continue to be protected by the upper cache oil pipe; on the other hand, during the up and down movement of the mover assembly 21, the oil is cached by the upper cache oil pipe.

[0148] In another embodiment of the present application, in order to improve the connection reliability between the mover assembly 21 and the bottom oil pump, the mover module 2 further includes a lower buffer connection assembly 23 .

[0149] The lower buffer connection assembly 23 includes two lower mounting seats 231 and a lower spring 232. The lower spring 232 is connected between the two lower mounting seats 231. The upper lower mounting seat 231 is connected to the mover core shaft 211 at the bottom, and the lower lower mounting seat 231 is configured to be connected to the oil pump.

[0150] Specifically, the movable core shaft 211 of the movable subassembly 21 at the bottom needs to be connected to the oil pump. The movable core shaft 211 and the oil pump are connected and fixed via the lower buffer connection assembly 23. During use, the lower spring 232 can undergo elastic deformation according to the force conditions, thereby buffering the impact force generated by the movable subassembly 21 on the oil pump during the upper and lower stroke switching process, so as to improve the reliability of use.

[0151] In another embodiment of the present application, the present application also provides an oil production equipment, including an oil pump and the above-mentioned linear motor, the linear motor is arranged vertically, the oil pump is arranged below the linear motor, and the mover core shaft 211 of the mover assembly 21 located at the bottom of the linear motor is connected to the oil pump.

[0152] Specifically, the oil production equipment includes an oil pump and the linear motor in the above embodiment. When in use, the linear motor is arranged vertically and located above the oil pump. In this way, the linear motor applies tension to the plunger of the oil pump to drive the oil pump to pump oil.

[0153] Since the linear motor is arranged above the oil pump, in actual use, it is only necessary to ensure that the submergence depth of the oil pump meets the oil extraction requirements. The linear motor can be partially located below the liquid surface or arranged above the liquid surface.

[0154] During the oil pumping process, the oil pressure sensing component 152 is immersed in the well fluid pumped out by the oil pump. Through the transmission of electrical insulating oil, the internal pressure of the linear motor can be dynamically balanced with the pressure in the well fluid channel of the oil pump in real time. The pressure difference is small or there is no pressure difference. The sealing effect of each seal is safe and reliable. The linear motor is not affected by the well fluid pressure, and can achieve long-term stable operation.

[0155] In another embodiment of the present application, the present application also provides an oil production equipment, including an oil pump and the above-mentioned linear motor, the linear motor is arranged horizontally, the oil pump is arranged at the rear end of the linear motor, and the mover core shaft 211 of the mover assembly 21 located at the rear end of the linear motor is connected to the oil pump.

[0156] Specifically, the oil production equipment includes an oil pump and the linear motor in the above embodiment. The linear motor is arranged horizontally in the oil well when in use. In this way, the oil pump can be arranged behind the linear motor. In this way, the linear motor drives the plunger of the oil pump to pump oil.

[0157] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A linear motor, characterized in that: include: A stator module, comprising a plurality of stator assemblies, each comprising an outer sleeve, an inner liner, and a coil winding. The coil winding and the inner liner are disposed in the outer sleeve, the coil winding is sleeved on the inner liner and sealed between the outer sleeve and the inner liner, and two adjacent outer sleeves are sealed and connected together. A mover module, the mover module comprising a plurality of mover assemblies and a mover connecting sleeve, the mover assembly comprising a mover core shaft and a permanent magnet, the permanent magnet being arranged on the outside of the mover core shaft, and an oil channel being formed inside the mover core shaft; a through-hole being provided on the side wall of the mover connecting sleeve, two adjacent mover core shafts being connected together by the mover connecting sleeve, and two adjacent oil channels being connected through the mover connecting sleeve; Wherein, the movable module is slidably arranged in the stator module, and the movable module is inserted into the inner liner tube; An oil gap is formed between the mover module and the inner liner tube, and the through-hole is configured so that the oil flowing in the oil channel flows into the oil gap through the through-hole, so that the oil can flow between the oil gap and the oil channel; The stator module also includes a pressure balancing assembly, which includes an outer protective tube and an oil pressure sensing component, and the oil pressure sensing component is arranged in the outer protective tube; a first pressure balancing cavity is formed in the oil pressure sensing component, and the first pressure balancing cavity is configured to be filled with electrical insulating oil; the oil pressure sensing component is configured to be deformed by the hydraulic pressure in the outer protective tube to adjust the pressure in the first pressure balancing cavity; a second pressure balancing cavity is formed between the outer sleeve and the inner lining tube, and the second pressure balancing cavity is configured to be filled with electrical insulating oil; wherein, the first pressure balancing cavity and the second pressure balancing cavity are connected.

2. The linear motor according to claim 1, characterized in that The stator assembly further includes two end seals, each end seal being provided with a first mounting through hole; The end seal is sealingly inserted into the corresponding pipe opening of the outer sleeve, and the end of the liner pipe is sealingly inserted into the first installation through hole; The coil winding is located between the two end seals, and the mover core shaft passes through the first mounting through hole.

3. The linear motor according to claim 2, characterized in that The stator module further includes a stator connector, wherein the stator connector is provided with a second mounting through hole; The two adjacent stator assemblies are sealed and fixedly connected together through the stator connector, the stator connector is sealed and connected to the end seals at the corresponding ends of the stator assembly, and the mover core shaft passes through the second mounting through hole.

4. The linear motor according to claim 3, characterized in that The end seal is provided with a first wiring hole, and the stator connector is provided with a second wiring hole; For the end seal and the stator connector connected together, the first wiring hole is communicated with the second wiring hole; The cables connected to the coil winding pass through the first wiring hole and the second wiring hole.

5. The linear motor according to claim 1, characterized in that The pressure balancing assembly is arranged between two adjacent stator assemblies, and the movable core shaft of at least one movable assembly is inserted into the outer sleeve; Alternatively, the pressure balancing component is arranged on the stator component at the lower end of the stator module, and the mover core shaft of at least one mover component is inserted into the outer sleeve.

6. The linear motor according to claim 1, wherein: The first pressure balance chamber is communicated with the second pressure balance chamber respectively; Alternatively, two adjacent second pressure-balancing chambers are communicated with each other, and the first pressure-balancing chamber is communicated with the second pressure-balancing chamber in the movable subassembly at the bottom.

7. The linear motor according to any one of claims 1 to 6, characterized in that: The stator assembly further includes two end seals, each end seal being provided with a first mounting through hole; The end seal is sealingly inserted into the corresponding pipe opening of the outer sleeve, and the end of the liner pipe is sealingly inserted into the first installation through hole; The outer sleeve and the inner liner form the second pressure balance cavity between the two end seals. The coil winding is located between the two end seals. The mover core shaft passes through the first mounting through hole.

8. The linear motor according to claim 7, characterized in that: The end seal is further provided with a first pressure communicating hole, the first pressure communicating hole being in communication with the second pressure balancing cavity; In the two stator assemblies connected together, the first pressure communication hole in one stator assembly is communicated with the adjacent first pressure communication hole in the other stator assembly.

9. The linear motor according to claim 8, characterized in that The stator module further includes a stator connector, the stator connector is provided with a second mounting through hole, and the stator connector is also provided with a second pressure communication hole; Two adjacent stator assemblies are sealed and fixedly connected together by the stator connector, the stator connector is sealed and connected to the end seals at the corresponding ends of the stator assembly, and the mover core shaft passes through the second mounting through hole; With the end seal and the stator connection member connected together, the first pressure communication hole is communicated with the second pressure communication hole.

10. The linear motor according to any one of claims 1 to 6, characterized in that The linear motor further includes an upper buffer oil pipe and / or a lower buffer oil pipe; the upper buffer oil pipe is arranged at the top of the stator module, and the lower buffer oil pipe is arranged at the bottom of the stator module; the upper buffer oil pipe is configured to communicate with the upper mover core shaft, and the lower buffer oil pipe is configured to communicate with the lower mover core shaft; And / or, the mover module also includes a lower buffer connection assembly, which includes two lower mounting seats and a lower spring, the lower spring is connected between the two lower mounting seats, the lower mounting seat located above is connected to the mover core shaft located at the bottom, and the lower mounting seat located below is configured to be connected to the oil pump.

11. An oil production equipment, comprising an oil well pump, characterized in that: Also included is a linear motor according to any one of claims 1 to 10, characterized in that the linear motor is arranged vertically, the oil pump is arranged below the linear motor, and the mover core shaft of the mover assembly located at the bottom of the linear motor is connected to the oil pump; Alternatively, the linear motor is arranged transversely, the oil pump is arranged at the rear end of the linear motor, and the mover core shaft of the mover assembly located at the rear end of the linear motor is connected to the oil pump.

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